US4407120A - Thrust reverser geared linkage - Google Patents
Thrust reverser geared linkage Download PDFInfo
- Publication number
- US4407120A US4407120A US06/180,671 US18067180A US4407120A US 4407120 A US4407120 A US 4407120A US 18067180 A US18067180 A US 18067180A US 4407120 A US4407120 A US 4407120A
- Authority
- US
- United States
- Prior art keywords
- cowl
- section
- aft
- pinion gear
- cowl section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/54—Nozzles having means for reversing jet thrust
- F02K1/64—Reversing fan flow
- F02K1/70—Reversing fan flow using thrust reverser flaps or doors mounted on the fan housing
- F02K1/72—Reversing fan flow using thrust reverser flaps or doors mounted on the fan housing the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- the invention relates to thrust reversing of aircraft gases and more specifically to the reversing of fan gases of a turbofan engine.
- Actuation mechanisms generally consist of links and linear actuator means for both cowl section translation and reverser or blocker deployment.
- a novel two-part reverser or blocker door is taught by U.S. Pat. Nos. 3,964,257 and 4,073,440, wherein the abutting ends of the reverser or blocker doors form curved single rack gears with interlocking and meshing teeth so that both reverser or blocker door operate simultaneously between their stowed and deployed positions.
- a clam shell type thrust reversing mechanism having curved single rack gear abutting ends on each claim shell for simultaneous movement between their stowed and deployed positions are taught in U.S. Pat. No. 3,759,467.
- the present invention obtains the benefits aforementioned while, in addition, providing an apparatus that has a positive action between a reverser or blocker door stowed and deployed position; weight has been reduced by a reduction of active elements required, which further reduces the required aircraft maintenance and resulting down time; the operation of the mechanism between the reverser or blocker door stowed and deployed positions provides and maintains engine pressure balance during deployment; and when the blocker doors are in their stowed position, the duct is free of drag producing door operating mechanism.
- the apparatus includes an elongated streamlined cowl surrounding the engine and control plug nozzle and is radially spaced therefrom to form a duct therebetween.
- the aft portion of the streamlined cowl section is translatable from a forward stowed position, where it abutts in a sealed relationship with the fixedly positioned forward cowl section, and aft deployed position where it forms an opening between the cowl sections for the exit of the engine gases in a reversed direction.
- a plurality of blocker doors are carried by the aft cowl section during translation.
- the blocker doors When the aft cowl section is translated aft, the blocker doors are rotated into the duct by two link members attached thereto at one end, with their other ends attached to a pinion gear at an off-center location.
- the teeth of the pinion gear engage two opposing gear racks, one gear rack is attached to and carried by the aft cowl section and the other gear rack is attached to the forward, fixedly-positioned cowl section.
- the translation of the aft cowl section causes the pinion gear to rotate, causing the links to rotate on the pinion gear and translate toward the central plug which rotates the reverser doors in or out of the duct depending on the direction of aft cowl translation.
- FIG. 1 is a side elevated showing of a turbofan engine with enclosing cowl and central plug.
- FIG. 2 is a rear view of the turbofan engine of FIG. 1 including aircraft pylon attachment means.
- FIG. 3 is a section taken along line 3--3 of FIG. 2.
- FIG. 4 is a showing of FIG. 3 with the aft cowl section translated to an aft blocker door deployed position.
- FIG. 5 is a section taken along line 5--5 of FIG. 3.
- FIG. 6 is a section taken along line 6--6 of FIG. 3.
- FIG. 7 is a section taken along line 7--7 of FIG. 3.
- FIG. 8 is a section of the turbofan engine of FIG. 1 looking forward at the aft cowl section actuating means.
- FIG. 9 is a section taken along line 9--9 of FIG. 8.
- FIG. 1 depicts an elevated side profile of a typical turbofan jet engine 10 with which the instant invention is practiced.
- the core engine includes a central plug 12 and a surrounding streamlined cowl 14.
- This streamlined cowl 14 is divided longitudinally into two sections, namely, a forward fixed section 16 and an aft translatable section 18.
- These cowl sections 16, 18 include a plurality of spaced apart fairings 20.
- a portion of each fairing 20 is carried by each cowl section 16, 18 and when the cowl sections abutt in a stowed position, the fairing portions likewise abutt.
- the fairing portions house portions of the aft cowl translation and reverser or blocker door 22 (shown in various figures) and its rotating-deploying mechanism, hereinafter discussed in specific detail.
- FIG. 2 shows the rear of the turbofan engine assembly looking forward.
- the engine aircraft pylon attachment 24 for engine mounting is shown.
- FIG. 3 is a partial section of the cowl 14 taken along line 3--3 of FIG. 2, exposing the operating mechanism of the apparatus of the instant invention.
- the operating mechanism is substantially concealed within the fairing 20 between the inner and outer cowling air flow surfaces 26, 28, respectively, and the fairing 20 is divided into two longitudinal sections: an aft fairing section 32 and a forward fairing section 34. One section is positioned on each of the cowl sections.
- the forward cowl section 16 is attached to the aircraft structure (not shown) and is fixed in position and the aft cowl section 18 is translatable with respect to the forward cowl section 16 between a forward stowed and a rearward fully translated position.
- the inner surface of the forward cowl section 16, the inner surface of the reverser or blocker doors 22, and the aft cowl section 18 form the outer fan gas boundaries, i.e. the inner walls of duct 36 (see FIG. 2).
- the outer cowl surface 28, see FIGS. 2, 3, 4, and 8, along with the outer surface of fairing 20 define the boundaries of the air stream passing along the outer surfaces of the engine 10 during flight.
- a translatable cascade ring 38 attached to the aft cowl section 18 and nests between the inner and outer surfaces 26, 28, respectively, of the aft cowl section 18 when the aft cowl section is in its forward-most stowed position, see FIGS. 1 and 3.
- Each reverser or blocker door 22, typically five or more are utilized, include hinges (not shown) connected between the ring 23 and the adjacent leading edge of the blocker doors forming a forward hinge line 25 and a deploying mechanism.
- This deploying mechanism comprises a pair of gear racks 40, 42, respectively, each gear rack having gear teeth along one surface.
- Gear rack 40 is shown as attached in a fixed location to aircraft structure through support hardware 39 and gear rack 42 is shown attached to and carried by the translatable aft cowl section 18 through an attachment to the fixed cascade ring 38. It should be understood that the invention could be practiced with the same effectivity if the position of the gear racks 40, 42, with respect to the control engine plug 12 were reversed in their relative positions as shown in the various figures.
- the translating gear rack 42 provides support means for a pinion gear 44.
- the support means see FIGS. 3-6, is formed by an outer and inner support shells 46, 48 which are held in place by convenient fastener means, bolt and nut combinations 50, 52, respectively, as shown, with a spacer 54 positioned around each bolt 50 between the inner wall 56 of the inner support shell 46.
- the support assembly includes track 58 with bushing surfaces 60 for engaging two slide blocks 62 (one shown with an identical one on the opposite side of the support assembly) carried by the central axle 64 of the pinion gear 44, see FIGS. 3, 4 and 7.
- the slider blocks 62 and the pinion gear 44 are carried, and held in their relative positions by the pinion gear central axle 64 and bushing surfaces 60 of tracks 58.
- the pinion gear 44 has an aperture 66 located intermediate the central axle 64 and its gear teeth 68.
- Door links 70 are positioned on each side of the pinion gear 44 and are carried at end 71 by a pivot pin 72 passing through the pinion gear aperture 66 and carried therby.
- the pivot pin 72 may be maintained in position by any known keeper means.
- the reverser or blocker door links 70 are rectilinear in form with their ends 74 opposite the pinion gear end 71 are pivotly attached through a second pivot 72 to a reverser door boss 76.
- door links 70 attachment to boss 76 is positioned nearer the central engine plug 12 than the door links' pinion gear connection 71.
- the aft translatable cowl section 18 is shown translated to its maximum deployed (aft) position.
- This translation is accomplished by a plurality of linear actuator means 78.
- the linear actuator 78 are pivotly attached at their forward end 80 to aircraft structures.
- a motor means well known in the art (not shown) is selectively operated from a remote location, drives a flexible drive shaft, which is interconnected at 84, to each linear actuator means 78, three or more linear actuators are generally used depending on size and weight of the aft cowl section 18.
- the drive shaft 84 uniformly extends and retracts the linear actuator rod 86 of each linear actuator means 78, thus uniformly translating the aft cowl section 18.
- the distal ends of the linear actuator rods 86 are pivotly attached to the cascade ring 38.
- the slider blocks 62 are translated to the forward end of track 58 (the pinion gear 44 being positioned at the forward end of the translatable gear rack 42) and at the aft end of fixed gear rack 40.
- the translation of the aft cowl section 18 rearward provides an opening 30 between the cowl sections 16, 18 and fairing 20 for the exiting of the blocked gases through the reversing cascade ring 38 which direct the gases forwardly through the opening 30.
- a two-part pressure seal 92 carried by the aft cowl section 18 provides a seal between the cowl section 16, 18 when they are in their stowed abutting position (see FIG. 3).
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/180,671 US4407120A (en) | 1980-08-25 | 1980-08-25 | Thrust reverser geared linkage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/180,671 US4407120A (en) | 1980-08-25 | 1980-08-25 | Thrust reverser geared linkage |
Publications (1)
Publication Number | Publication Date |
---|---|
US4407120A true US4407120A (en) | 1983-10-04 |
Family
ID=22661306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/180,671 Expired - Lifetime US4407120A (en) | 1980-08-25 | 1980-08-25 | Thrust reverser geared linkage |
Country Status (1)
Country | Link |
---|---|
US (1) | US4407120A (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4527391A (en) * | 1982-09-30 | 1985-07-09 | United Technologies Corporation | Thrust reverser |
US4533098A (en) * | 1983-06-20 | 1985-08-06 | General Electric Company | Thrust reverser attachment |
US4819876A (en) * | 1987-06-25 | 1989-04-11 | United Technologies Corporation | Divergent flap actuation system for a two-dimensional exhaust nozzle |
US4909442A (en) * | 1984-05-14 | 1990-03-20 | The Boeing Company | Actuation system for a blocker door in a jet engine nacelle |
US5096144A (en) * | 1991-03-18 | 1992-03-17 | United Technologies Corporation | Reverser door actuation mechanism |
US5209057A (en) * | 1991-10-23 | 1993-05-11 | Rohr, Inc. | Rack and pinion actuation for an aircraft engine thrust reverser |
US5548954A (en) * | 1993-11-24 | 1996-08-27 | Societe Hispano Suiza | Turbojet engine thrust reverser with rear support structure |
EP0790399A1 (en) * | 1996-02-15 | 1997-08-20 | Hispano Suiza | Thrust reverser for a jet engine with doors linked to a front panel |
US5725182A (en) * | 1995-02-21 | 1998-03-10 | Societe Hispano Suiza | Turbo fan engine thrust reverser |
FR2758161A1 (en) * | 1997-01-09 | 1998-07-10 | Hispano Suiza Sa | GRID DRIVE INVERTER WITH OPTIMIZED CONTROL JACK INSTALLATION |
US5927647A (en) * | 1997-09-24 | 1999-07-27 | Rohr, Inc. | Blocker door frame pressure structure for translating cowl of cascade thrust reverser for aircraft jet engine |
FR2821892A1 (en) * | 2001-03-08 | 2002-09-13 | Hispano Suiza Sa | SYSTEM FOR ACTUATING THE MOBILE COVERING OF A DRIVE INVERTER IN A TURBOJET |
US20070109054A1 (en) * | 2005-11-12 | 2007-05-17 | Manuel De Jesus Rodriguez | Signal amplification through an electromagnetic device |
US20100064659A1 (en) * | 2007-08-08 | 2010-03-18 | Rohr, Inc. | Translating variable area fan nozzle with split beavertail fairings |
US20100212286A1 (en) * | 2009-02-25 | 2010-08-26 | Spirit Aerosystems, Inc. | Thrust reverser configuration for a short fan duct |
US20110277448A1 (en) * | 2010-05-17 | 2011-11-17 | Rohr, Inc. | Guide system for nacelle assembly |
EP2239449A3 (en) * | 2009-04-06 | 2011-12-28 | Rohr, Inc. | Nacelle assembly for turbofan aircraft engines |
US20130062433A1 (en) * | 2010-04-20 | 2013-03-14 | Aircelle | Nacelle for an aircraft engine with variable cross-section nozzle |
US8511973B2 (en) | 2010-06-23 | 2013-08-20 | Rohr, Inc. | Guide system for nacelle assembly |
EP2886843A1 (en) * | 2013-12-19 | 2015-06-24 | Rolls-Royce Deutschland Ltd & Co KG | Aviation gas turbine having an engine cowl with thrust reverser |
FR3016863A1 (en) * | 2014-01-29 | 2015-07-31 | Snecma | NACELLE FOR AIRCRAFT TURBO AIRCRAFT |
WO2016007171A1 (en) * | 2014-07-11 | 2016-01-14 | Mra Systems, Inc. | Integrated thrust reverser actuation system |
US9759087B2 (en) | 2007-08-08 | 2017-09-12 | Rohr, Inc. | Translating variable area fan nozzle providing an upstream bypass flow exit |
US11261826B2 (en) * | 2018-09-13 | 2022-03-01 | Rohr, Inc. | Hidden link system blocker door |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3500646A (en) * | 1968-04-19 | 1970-03-17 | Rohr Corp | Thrust reverser |
US3511055A (en) * | 1968-05-29 | 1970-05-12 | Rohr Corp | Thrust reverser |
US3759467A (en) * | 1969-07-10 | 1973-09-18 | Etude Construction De Monteurs | Method and means for opposing the rotation of a windmilling turbojet rotor during flight |
-
1980
- 1980-08-25 US US06/180,671 patent/US4407120A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3500646A (en) * | 1968-04-19 | 1970-03-17 | Rohr Corp | Thrust reverser |
US3511055A (en) * | 1968-05-29 | 1970-05-12 | Rohr Corp | Thrust reverser |
US3759467A (en) * | 1969-07-10 | 1973-09-18 | Etude Construction De Monteurs | Method and means for opposing the rotation of a windmilling turbojet rotor during flight |
Cited By (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4527391A (en) * | 1982-09-30 | 1985-07-09 | United Technologies Corporation | Thrust reverser |
US4533098A (en) * | 1983-06-20 | 1985-08-06 | General Electric Company | Thrust reverser attachment |
US4909442A (en) * | 1984-05-14 | 1990-03-20 | The Boeing Company | Actuation system for a blocker door in a jet engine nacelle |
US4819876A (en) * | 1987-06-25 | 1989-04-11 | United Technologies Corporation | Divergent flap actuation system for a two-dimensional exhaust nozzle |
US5096144A (en) * | 1991-03-18 | 1992-03-17 | United Technologies Corporation | Reverser door actuation mechanism |
US5209057A (en) * | 1991-10-23 | 1993-05-11 | Rohr, Inc. | Rack and pinion actuation for an aircraft engine thrust reverser |
US5548954A (en) * | 1993-11-24 | 1996-08-27 | Societe Hispano Suiza | Turbojet engine thrust reverser with rear support structure |
US5725182A (en) * | 1995-02-21 | 1998-03-10 | Societe Hispano Suiza | Turbo fan engine thrust reverser |
WO1997030279A1 (en) * | 1996-02-15 | 1997-08-21 | Societe Hispano-Suiza | Jet engine thrust reverser with doors linked to an upstream panel |
FR2745035A1 (en) * | 1996-02-15 | 1997-08-22 | Hispano Suiza Sa | TURBOREACTOR DRIVE INVERTER WITH DOORS ASSOCIATED WITH A UPSTREAM PANEL |
EP0790399A1 (en) * | 1996-02-15 | 1997-08-20 | Hispano Suiza | Thrust reverser for a jet engine with doors linked to a front panel |
US5782434A (en) * | 1996-02-15 | 1998-07-21 | Societe Hispano Suiza | Self-closing pivoting door thrust reverser with gear actuated panel |
FR2758161A1 (en) * | 1997-01-09 | 1998-07-10 | Hispano Suiza Sa | GRID DRIVE INVERTER WITH OPTIMIZED CONTROL JACK INSTALLATION |
EP0853192A1 (en) * | 1997-01-09 | 1998-07-15 | Hispano-Suiza | Thrust reverser with optimized cascade actuator position |
WO1998030794A1 (en) * | 1997-01-09 | 1998-07-16 | Hispano Suiza | Thrust reverser with blade rows with optimised actuator control |
US6000216A (en) * | 1997-01-09 | 1999-12-14 | Societe Hispano Suiza | Actuating system for a cascade type thrust reverser |
US5927647A (en) * | 1997-09-24 | 1999-07-27 | Rohr, Inc. | Blocker door frame pressure structure for translating cowl of cascade thrust reverser for aircraft jet engine |
FR2821892A1 (en) * | 2001-03-08 | 2002-09-13 | Hispano Suiza Sa | SYSTEM FOR ACTUATING THE MOBILE COVERING OF A DRIVE INVERTER IN A TURBOJET |
US6592074B2 (en) | 2001-03-08 | 2003-07-15 | Hurel-Hispano | System driving the displaceable fairing of a turbojet-engine thrust reverser |
US20070109054A1 (en) * | 2005-11-12 | 2007-05-17 | Manuel De Jesus Rodriguez | Signal amplification through an electromagnetic device |
US20100229527A1 (en) * | 2007-08-08 | 2010-09-16 | Rohr, Inc. | Translating variable area fan nozzle providing an upstream bypass flow exit |
US9970387B2 (en) | 2007-08-08 | 2018-05-15 | Rohr, Inc. | Variable area fan nozzle with bypass flow |
US20100064659A1 (en) * | 2007-08-08 | 2010-03-18 | Rohr, Inc. | Translating variable area fan nozzle with split beavertail fairings |
US20100229528A1 (en) * | 2007-08-08 | 2010-09-16 | Rohr, Inc. | Actuation system for a translating variable area fan nozzle |
US9777671B2 (en) | 2007-08-08 | 2017-10-03 | Rohr, Inc. | Actuation system for a translating variable area fan nozzle |
US9759087B2 (en) | 2007-08-08 | 2017-09-12 | Rohr, Inc. | Translating variable area fan nozzle providing an upstream bypass flow exit |
US8402765B2 (en) | 2007-08-08 | 2013-03-26 | Rohr, Inc. | Translating variable area fan nozzle providing an upstream bypass flow exit |
US8505307B2 (en) | 2007-08-08 | 2013-08-13 | Rohr, Inc. | Translating variable area fan nozzle with split beavertail fairings |
US8511062B2 (en) | 2007-08-08 | 2013-08-20 | Rohr, Inc. | Actuation system for a translating variable area fan nozzle |
US8316632B2 (en) | 2009-02-25 | 2012-11-27 | Spirit Aerosystems, Inc. | Thrust reverser configuration for a short fan duct |
US20100212286A1 (en) * | 2009-02-25 | 2010-08-26 | Spirit Aerosystems, Inc. | Thrust reverser configuration for a short fan duct |
EP2239449A3 (en) * | 2009-04-06 | 2011-12-28 | Rohr, Inc. | Nacelle assembly for turbofan aircraft engines |
US20130062433A1 (en) * | 2010-04-20 | 2013-03-14 | Aircelle | Nacelle for an aircraft engine with variable cross-section nozzle |
US8726634B2 (en) * | 2010-04-20 | 2014-05-20 | Aircelle | Nacelle for an aircraft engine with variable cross-section nozzle having a rack and pinion actuator assembly |
US8875486B2 (en) * | 2010-05-17 | 2014-11-04 | Rohr, Inc. | Guide system for nacelle assembly |
US20110277448A1 (en) * | 2010-05-17 | 2011-11-17 | Rohr, Inc. | Guide system for nacelle assembly |
US8511973B2 (en) | 2010-06-23 | 2013-08-20 | Rohr, Inc. | Guide system for nacelle assembly |
EP2886843A1 (en) * | 2013-12-19 | 2015-06-24 | Rolls-Royce Deutschland Ltd & Co KG | Aviation gas turbine having an engine cowl with thrust reverser |
WO2015114241A1 (en) * | 2014-01-29 | 2015-08-06 | Snecma | Nacelle for an aeroplane turbojet |
FR3016863A1 (en) * | 2014-01-29 | 2015-07-31 | Snecma | NACELLE FOR AIRCRAFT TURBO AIRCRAFT |
US10273016B2 (en) * | 2014-01-29 | 2019-04-30 | Safran Aircraft Engines | Nacelle for an airplane turbojet |
WO2016007171A1 (en) * | 2014-07-11 | 2016-01-14 | Mra Systems, Inc. | Integrated thrust reverser actuation system |
EP3167178A1 (en) * | 2014-07-11 | 2017-05-17 | MRA Systems, Inc. | Integrated thrust reverser actuation system |
US11261826B2 (en) * | 2018-09-13 | 2022-03-01 | Rohr, Inc. | Hidden link system blocker door |
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Legal Events
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AS | Assignment |
Owner name: ROHR INDUSTRIES, INC.,CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TIMMS RICHARD H.;REEL/FRAME:003796/0489 Effective date: 19800820 |
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AS | Assignment |
Owner name: CITIBANK, N.A., Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:ROHR INDUSTRIES, INC.;REEL/FRAME:003922/0822 Effective date: 19810921 |
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AS | Assignment |
Owner name: ROHR INDUSTRIES, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CITIBANK, N. A.;REEL/FRAME:004201/0686 Effective date: 19830819 Owner name: ROHR INDUSTRIES, INC.,CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CITIBANK, N. A.;REEL/FRAME:004201/0686 Effective date: 19830819 |
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |